//===----- CXXABI.h - Interface to C++ ABIs ---------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This provides an abstract class for C++ AST support. Concrete
// subclasses of this implement AST support for specific C++ ABIs.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_AST_CXXABI_H
#define LLVM_CLANG_AST_CXXABI_H

namespace clang {

class ASTContext;
class MemberPointerType;

/// Implements C++ ABI-specific semantic analysis functions.
class CXXABI
{
public:
    virtual ~CXXABI();

    /// Returns the size of a member pointer in multiples of the target
    /// pointer size.
    virtual unsigned getMemberPointerSize(const MemberPointerType* MPT) const = 0;

    /// Returns the default calling convention for C++ methods.
    virtual CallingConv getDefaultMethodCallConv() const = 0;

    // Returns whether the given class is nearly empty, with just virtual pointers
    // and no data except possibly virtual bases.
    virtual bool isNearlyEmpty(const CXXRecordDecl* RD) const = 0;
};

/// Creates an instance of a C++ ABI class.
CXXABI* CreateARMCXXABI(ASTContext& Ctx);
CXXABI* CreateItaniumCXXABI(ASTContext& Ctx);
CXXABI* CreateMicrosoftCXXABI(ASTContext& Ctx);
} // namespace clang

#endif
